Oculist&#39;s lamp



H. L. BAUM Er AL OCULIST.S LAMP July 6 1926.

2 Sheets-Sheet- 1 Filed Nov. 10, 1925 m M L y m famed 1/1. J'fiielid.

July 6 1926.

H. L. BAUM El AL ocULIs'Rs LAMP 2 Sheets-Shasta Filed Nov. 10. 1925 grwentofd elM.

duo: M!

. Patented July 1926.

" LTED ums PATENT o HARRY L. 'BAUM AM) James M. SHIELDS, or nnnvnn, coLonAnmqAssrGNo-ns ro 2am; v. MUCZKLE Ann GGMPANY, orpnnvnn, COLORADO, "A ooaronnrron or Corona-my Application fire-(1' November This invention relates to improvements in ocullsts lamps.

It is the object, of this invention to produce. a lamp that shall be especially well for example, projecting upon a screen.

slide showin histological sections.

vThe lamp 'tormingflthe' subject of this inventionis especially well adapted for the following yusesz".

' 'ment of theeye-forthe presence of foreign bodies and changes due to diseasa by, using without filament; shadow; for surgical operations,anda =(6) For the projction of histological sec w p v p r either white orred-tree light. 7

(2).For producing the necessary white orred free light for ,retinosc'opy.

:13) For furnishing the necessary light for ophthalmoscopi c examinations. I

(4) For centric retinoscopy or retinoscopy l Y ,.A cy1-indrica1 housing 8"'having-a' semispherica-l integralend 9 has anouterdi amw with a minute aperture (5-) For furnishing: even-zwhite light,

tion's.

Another object ofthisinventionis to produce a lamphouse: that shall be so 0on structed as to belight-tight and at the same;

. time be sowell ventilatedthat its outer sur- 1 and oculists trial lens and thereby makes face will remain comparatively cool.

I Aqturther objectis to prod-ucea lamp of.

- ing 8' directly above. the circular row of open- 7 I Securedvto ,the interior of the Jhousing 8; is a semi-spherical member 15 this type that employs the regular opt-ician it possible for "the owner to produce any desired beam of light without necessitating.

the expenditure of further money for special: lenses. i i

I The above'and other obj-ects'that may ap-.- 3 pear as the description proceeds are attained bya"construction ;that will now be described in detail, reference for this purpose being;

had to the accompanying: drawings in which .the invention has been illustrated in its present preterred form'and in which:

Fig; 1 is a side 'elevationf'ofthe improved "lamp with fparts thereof. broken away to better disclose the construction portion thereof being. shown in section;

Fig.3 is a view taken on line 3 3, Fig. 1,

jectiv e lens,

(1) For producing'oblique illuminationfor the purpose ofexamining theanterior seging ring. 6 and the. periphery of the flange OCULISTS LAMP.

10, 1925..- Serial ac. 8,045.

and shows the bra-chet for supporting the "obof the housing, taken onll-ine 5-- +5,l ig...1,

nd a 6 is asection takenon'linf 6+6;

partsthereof being shown in Referring. nowyto the. drawings; numeral I represents the bottom of the lamp housing.

This member is circular and has-it's outer.

edges? bentupwardly at rigl'it. angles so as separates the lower surface of the clamping ring. 5 from the upper surface of the basel.

eter :substantially the same as the interior -diameter of the flange 2. The.openend of member. 8 fits. inside of the flange :2 and is ring. having a cylindrical portionlI; a conical .part 12 and an outwardlyextendingflange 13, has its [cylindricalportion extending f downwardly into the interior of the clamp- 1 3 in contact with the interior ofthe' housings 514;.

from the inner surface of the spherical end I surface .9. A row'of holes 18' extends around v V the housingdirectly below 'the flange 16. A conical baffle '19 has an outwardly project ing. flange 20 that is secured to the interior of the housing; this bafile isopen at the separates the outer surface .of member- 15' top so'as: to permitair to pass from theinl terior and outthroughholes 18. Theinner surface of the housing bet-ween flanges 13 and 20 is lined with asbestosboa'rd 21. A

lamp-22 is connected to the socket 4 and;

receives current from-the transformer 28.

'VVhen the lampis burning it generates a large amount of. heat; this would very soon 70 .to form a flange and is providedlwithia, central opening surrounded by. theiintegral 1 downwardly projecting flange 3 which ref An apertured disk 36 is pivoted to the bracket by the screw 37 and can be swung from raise the temperature of the housing sohigh that it would be uncomfortable to come in v baffle 19,

contact with it. Air will enter the housing through openings 14: pass downwardly underneath the clamping ring 6 and through the holes in this and thence upwardly pass'' 26 extends about the lower half of. the opening 25 and is adapted to receive and hold the condenser lens 27 which may be an ordi- "nary trial lens. A square rod or slide 23 is secured to the bottom "1 by means of screws 29 and to the outer end of this the bracket 3O is'connected;v The upper end of this bracket has a semi-circular 'notch 31 surrounded bya groove 32 which is adapted to receive the ,objective lens 33 that has been indicated by broken lines and which, like lens 27 is an oculists trial lens. A spring .34 is fastened to one arm of the bracket 30 and has two fingers 35 that embrace the edge of the lens and holds the same in place.

the position shown in Fig. 3 to a position in front'of the lens33. A spring 38 enclosed I in a housing 39 puts pressure on the disk and serves to provide the required amount of friction tohold it in adjusted position.

The posterior surface of this disk is'painted black so as to prevent the reflection of the light rays. Mounted so as to be freely slidable along-the rod 28 is a bracket- 40 that projects upwardly from the sleeve 41. This bracket is substantially identical in construction with the bracket 30 that has just been described. The semi-circular groove 42 is intended to receive a VVratten gelatin light filter 413 of such color and consistency th at itpermits all but the red rays to pass through and which therefore makesit pos- 5 sible toobtain a red-free light which is usesame size and shape as thecorresponding ful for many purposes. A spring 343 of the spring in Fig. 3 holds the'filter in place.

Secured to the sleeve 41 directly 'in front of the bracket 40 is a vertical standard 44 which terminates in a transverse arm 45 from the ends of which the vertical standards 46 and 17, which" are slightly thinner i than the arm 45,'extend upwardly (Fig. 1).

Secured to arm 45 directly in front of the vertical standards 46 and 47 are springs 48 The 7 air passages. and

tions that accompany the device.

and 49, the purpose of which is to provid'e means for holding a microscopic slide in place so that it may be adjusted to the proper position'for projection. By selecting the proper lenses, 2'? and33, the lamp may be employed as a projector for the purpose of projecting histological sections onto a screen. The focusing is accomplishedlby sliding the brackets 40 and 44 along the guide 28.

One mportant advantage of theconstruc-- tion above described is that the condenser lens will not fog; this is due to the fact that the lamp housing is so thoroughly ventilated that the condensation of moisture-will not" take place on the lens.

It is evident to any one versed in the science of optics that by employingdif- I ferent kinds of lenses as the condenser (27) or objective (33) that the rays of light from the lamp 22 may be formed into beams having parallel, convergent or divergent rays.

This lamp can be used for many different purposes, the principal ones being those 811111 merated above. Itis not. our object to give detailed directions for the'use ofthislamp, as this belongs more properly. to the instrucdescribed above and The construction shown on the drawings is particularly well adapted for the purposes ffor which it is intended as it is of a pleasing design and so constructed that it is entirely light proof and at the same time well ventilated; The

lens supporting brackets'have been designed with the particular object in view of employing in combination therewith the ordinary oc'ulists trial-lens as this -makes it possible for an oculist to obtain, without additional expense, almost any conceivable combination. The perforated disk 36 is em ployed in centric retinoscopy as well as for other purposes where a small beam of light is necessary. I 7 Y Having now described the-invention what is claimed as new is:

1. In an-oculists lamp,

in combination, a

circular base member having its outer edge formed into a cylindrical flange, said base having a central opening, a lamp socket in said opening, a clamping ring for holding said socket in place, a housing member secured at one end to the flange on the base and having its other end closed, saldhousng member havmg a row of openings near its upper endand another 'row near its lower 7 end and battle members of conical-shape secured to the interior surface of-the'housing intermediate the said rows ofopenings, the conical portions of said "baflies extending across said row of openings so as to prevent light. from passing out from the housing through said rows of openings.

2. A. lamp housing for u'sein theexamination of eyes, comprising, in combination, a

circularbase member having its edges turned so asto form a cylindrical flange, said base havlng a central opening Whose edges are 'formed into a cylindrical flange a lamp at right angles to the bottom of the ring so as to provide an upwardly extending flange, a conical baffle member having-- its smaller end terminating in a cylindrical 'portion adapted to extend down into the clampmg ring and having its larger end formed into an outwardly projecting flange adapted to engagethe innersurface of the housing, said housing having a row of holes below the flange'of the conical member, a second conical member secured to the inner surface of thehousing near thefupper end thereof, said housinghaving another row of holes above the line Where the upper cone is connected to it and a lamp in said socket In testimony whereof We aflix our signatures. s

HARRY LQBAUM, 7 JAMES smnnnsp 

